2014-05-18 22:10:48 +02:00
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/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
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/***
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This file is part of systemd.
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Copyright 2014 Tom Gundersen <teg@jklm.no>
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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***/
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#include <arpa/inet.h>
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#include <resolv.h>
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#include <linux/if.h>
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#include "resolved.h"
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#include "event-util.h"
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#include "network-util.h"
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#include "sd-dhcp-lease.h"
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#include "dhcp-lease-internal.h"
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#include "network-internal.h"
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#include "conf-parser.h"
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static int set_fallback_dns(Manager *m, const char *string) {
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char *word, *state;
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size_t length;
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int r;
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assert(m);
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assert(string);
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FOREACH_WORD_QUOTED(word, length, string, state) {
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_cleanup_free_ Address *address = NULL;
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Address *tail;
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_cleanup_free_ char *addrstr = NULL;
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address = new0(Address, 1);
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if (!address)
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return -ENOMEM;
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addrstr = strndup(word, length);
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if (!addrstr)
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return -ENOMEM;
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r = net_parse_inaddr(addrstr, &address->family, &address->in_addr);
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if (r < 0) {
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log_debug("Ignoring invalid DNS address '%s'", addrstr);
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continue;
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}
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LIST_FIND_TAIL(addresses, m->fallback_dns, tail);
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LIST_INSERT_AFTER(addresses, m->fallback_dns, tail, address);
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address = NULL;
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}
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return 0;
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}
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int config_parse_dnsv(
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const char *unit,
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const char *filename,
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unsigned line,
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const char *section,
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unsigned section_line,
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const char *lvalue,
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int ltype,
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const char *rvalue,
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void *data,
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void *userdata) {
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Manager *m = userdata;
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Address *address;
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assert(filename);
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assert(lvalue);
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assert(rvalue);
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assert(m);
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while ((address = m->fallback_dns)) {
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LIST_REMOVE(addresses, m->fallback_dns, address);
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free(address);
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}
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set_fallback_dns(m, rvalue);
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return 0;
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}
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static int manager_parse_config_file(Manager *m) {
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int r;
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assert(m);
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2014-07-07 23:03:17 +02:00
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r = config_parse(NULL, "/etc/systemd/resolved.conf", NULL,
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"Resolve\0", config_item_perf_lookup, (void*) resolved_gperf_lookup,
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false, false, m);
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2014-05-18 22:10:48 +02:00
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if (r < 0)
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log_warning("Failed to parse configuration file: %s", strerror(-r));
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return r;
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}
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int manager_new(Manager **ret) {
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_cleanup_manager_free_ Manager *m = NULL;
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int r;
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2014-07-07 23:11:48 +02:00
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assert(ret);
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2014-05-18 22:10:48 +02:00
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m = new0(Manager, 1);
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if (!m)
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return -ENOMEM;
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r = set_fallback_dns(m, DNS_SERVERS);
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if (r < 0)
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return r;
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r = manager_parse_config_file(m);
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if (r < 0)
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return r;
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r = sd_event_default(&m->event);
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if (r < 0)
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return r;
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sd_event_add_signal(m->event, NULL, SIGTERM, NULL, NULL);
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sd_event_add_signal(m->event, NULL, SIGINT, NULL, NULL);
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sd_event_set_watchdog(m->event, true);
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*ret = m;
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m = NULL;
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return 0;
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}
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void manager_free(Manager *m) {
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Address *address;
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if (!m)
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return;
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sd_event_unref(m->event);
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while ((address = m->fallback_dns)) {
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LIST_REMOVE(addresses, m->fallback_dns, address);
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free(address);
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}
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free(m);
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}
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static void append_dns(FILE *f, void *dns, unsigned char family, unsigned *count) {
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char buf[INET6_ADDRSTRLEN];
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const char *address;
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assert(f);
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assert(dns);
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assert(count);
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address = inet_ntop(family, dns, buf, INET6_ADDRSTRLEN);
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if (!address) {
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log_warning("Invalid DNS address. Ignoring.");
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return;
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}
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if (*count == MAXNS)
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fputs("# Too many DNS servers configured, the following entries "
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"may be ignored\n", f);
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fprintf(f, "nameserver %s\n", address);
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(*count) ++;
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}
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int manager_update_resolv_conf(Manager *m) {
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2014-06-02 15:13:30 +02:00
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const char *path = "/run/systemd/resolve/resolv.conf";
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2014-05-18 22:10:48 +02:00
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_cleanup_free_ char *temp_path = NULL;
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_cleanup_fclose_ FILE *f = NULL;
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_cleanup_free_ unsigned *indices = NULL;
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Address *address;
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unsigned count = 0;
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int n, r, i;
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assert(m);
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2014-06-02 15:13:30 +02:00
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r = fopen_temporary(path, &f, &temp_path);
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2014-05-18 22:10:48 +02:00
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if (r < 0)
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return r;
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fchmod(fileno(f), 0644);
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fputs("# This file is managed by systemd-resolved(8). Do not edit.\n#\n"
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"# Third party programs must not access this file directly, but\n"
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"# only through the symlink at /etc/resolv.conf. To manage\n"
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"# resolv.conf(5) in a different way, replace the symlink by a\n"
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"# static file or a different symlink.\n\n", f);
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n = sd_network_get_ifindices(&indices);
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if (n < 0)
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n = 0;
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for (i = 0; i < n; i++) {
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_cleanup_dhcp_lease_unref_ sd_dhcp_lease *lease = NULL;
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struct in_addr *nameservers;
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struct in6_addr *nameservers6;
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size_t nameservers_size;
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r = sd_network_dhcp_use_dns(indices[i]);
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if (r > 0) {
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r = sd_network_get_dhcp_lease(indices[i], &lease);
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if (r >= 0) {
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r = sd_dhcp_lease_get_dns(lease, &nameservers, &nameservers_size);
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if (r >= 0) {
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unsigned j;
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for (j = 0; j < nameservers_size; j++)
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append_dns(f, &nameservers[j], AF_INET, &count);
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}
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}
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}
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r = sd_network_get_dns(indices[i], &nameservers, &nameservers_size);
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if (r >= 0) {
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unsigned j;
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for (j = 0; j < nameservers_size; j++)
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append_dns(f, &nameservers[j], AF_INET, &count);
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free(nameservers);
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}
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r = sd_network_get_dns6(indices[i], &nameservers6, &nameservers_size);
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if (r >= 0) {
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unsigned j;
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for (j = 0; j < nameservers_size; j++)
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append_dns(f, &nameservers6[j], AF_INET6, &count);
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free(nameservers6);
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}
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}
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LIST_FOREACH(addresses, address, m->fallback_dns)
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append_dns(f, &address->in_addr, address->family, &count);
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fflush(f);
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2014-06-02 15:13:30 +02:00
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if (ferror(f) || rename(temp_path, path) < 0) {
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2014-05-18 22:10:48 +02:00
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r = -errno;
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2014-06-02 15:13:30 +02:00
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unlink(path);
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2014-05-18 22:10:48 +02:00
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unlink(temp_path);
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return r;
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}
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return 0;
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}
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static int manager_network_event_handler(sd_event_source *s, int fd, uint32_t revents,
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void *userdata) {
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Manager *m = userdata;
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int r;
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assert(m);
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r = manager_update_resolv_conf(m);
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if (r < 0)
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log_warning("Could not update resolv.conf: %s", strerror(-r));
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sd_network_monitor_flush(m->network_monitor);
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return 0;
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}
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int manager_network_monitor_listen(Manager *m) {
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_cleanup_event_source_unref_ sd_event_source *event_source = NULL;
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_cleanup_network_monitor_unref_ sd_network_monitor *monitor = NULL;
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int r, fd, events;
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r = sd_network_monitor_new(NULL, &monitor);
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if (r < 0)
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return r;
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fd = sd_network_monitor_get_fd(monitor);
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if (fd < 0)
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return fd;
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events = sd_network_monitor_get_events(monitor);
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if (events < 0)
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return events;
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r = sd_event_add_io(m->event, &event_source, fd, events,
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&manager_network_event_handler, m);
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if (r < 0)
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return r;
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m->network_monitor = monitor;
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m->network_event_source = event_source;
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monitor = NULL;
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event_source = NULL;
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return 0;
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}
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